import axios from 'axios'
import store from '@/store'
import storage from 'store'
import notification from 'ant-design-vue/es/notification'
import { VueAxios } from './axios'
import { ACCESS_TOKEN } from '@/store/mutation-types'

// 用于存储正在刷新的请求
let isRefreshing = false
// 重试队列，每一项将是一个待执行的函数
let requests = []

// 创建 axios 实例
const request = axios.create({
  // API 请求的默认前缀
  baseURL: '', // process.env.VUE_APP_API_BASE_URL,
  timeout: 6000 // 请求超时时间
})

// 异常拦截处理器
const errorHandler = (error) => {
  if (error.response) {
    const data = error.response.data
    // 从 localstorage 获取 token
    const token = storage.get(ACCESS_TOKEN)
    if (error.response.status === 403) {
      notification.error({
        message: 'Forbidden',
        description: data.message
      })
    }
    if (error.response.status === 401 && !(data.result && data.result.isLogin)) {
      notification.error({
        message: 'Unauthorized',
        description: 'Authorization verification failed'
      })
      if (token) {
        store.dispatch('Logout').then(() => {
          setTimeout(() => {
            window.location.reload()
          }, 1500)
        })
      }
    }
  }
  return Promise.reject(error)
}

// request interceptor
request.interceptors.request.use((config) => {
  const token = storage.get(ACCESS_TOKEN)
  // 如果 token 存在
  // 让每个请求携带自定义 token 请根据实际情况自行修改
  if (token) {
    config.headers['Authorization'] = token
  }
  return config
}, errorHandler)

// response interceptor
request.interceptors.response.use((response) => {
  const { data } = response
  if (data && data.code === 401) {
    const config = response.config

    if (!isRefreshing) {
      isRefreshing = true
      // const refreshToken = storage.get(REFRESH_TOKEN)
      // if (!refreshToken) {
      //   store.dispatch('Logout')
      //   return Promise.reject(new Error('No refresh token available'))
      // }

      return store
        .dispatch('RefreshToken')
        .then((accessToken) => {
          // 执行队列中的请求
          requests.forEach((cb) => cb(accessToken))
          requests = []
          // 重试当前请求
          config.headers['Authorization'] = accessToken
          return request(config)
        })
        .catch((err) => {
          store.dispatch('Logout')
          return Promise.reject(err)
        })
        .finally(() => {
          isRefreshing = false
        })
    } else {
      // 正在刷新token，将请求存入队列
      return new Promise((resolve) => {
        requests.push((accessToken) => {
          config.headers['Authorization'] = accessToken
          resolve(request(config))
        })
      })
    }
  }
  if (data && data.code === 403) {
    notification.error({
      message: 'Unauthorized',
      description: 'Authorization verification failed'
    })
    store.dispatch('exitSystem').then(() => {
      setTimeout(() => {
        window.location.reload()
      }, 1500)
    })
  }
  return data
}, errorHandler)

const installer = {
  vm: {},
  install (Vue) {
    Vue.use(VueAxios, request)
  }
}

export default request

export { installer as VueAxios, request as axios }
